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【单选题】
男,60岁。因剧烈胸痛4小时入院治疗,心电图示性心律,心率55次/分11.111.aVF导联ST段拾高0.3mV,其余导联ST段正常。介人治疗前临时起搏器起搏心室,以60次/分频率起搏时,监测动脉血压由100/70mHg降低85/60mmHgs导致这种血压变化的最可能原因是A.
起搏心律时外血管阻力降低致血压下降
B.
合并石心室梗死，右室排血减少致充盈减少
C.
起搏心律时心肌收缩力较弱致心输出量降低
D.
起搏心律时心率增快，舒张期缩短导致回心血量减少
E.
起搏时失去心房收缩对心室的充盈作用，充盈减少
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举一反三
【单选题】What does David Acheson think about the mandatory program?
A.
He has some doubts about whether it will have an impact.
B.
He thinks that restaurants and farms should also be included in the program.
C.
He thinks that PDA may not have the necessary administrative power.
D.
He worries that different apartments may compete with one another for authority.
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